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Atmospheric aerosols as prebiotic chemical reactors
C M Dobson1, G B Ellison, A F Tuck
1Oxford Centre for Molecular Sciences, New Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QT, United Kingdom.
Summary
Atmospheric aerosols, rich in organic material, may have provided environments for prebiotic chemical transformations. These particles, similar in size to early single-celled organisms, could be precursors to life.
Area of Science:
- Astrobiology
- Atmospheric Chemistry
- Origin of Life Studies
Background:
- Atmospheric aerosols possess significant organic material content, explainable by an inverted micelle model.
- Aerosol particles with substantial atmospheric lifetimes share dimensions comparable to single-celled organisms.
- The size distribution of these aerosols is governed by aerodynamic drag, surface tension, and gravity.
Purpose of the Study:
- To propose atmospheric aerosols as potential environments for prebiotic chemical transformations.
- To suggest aerosols as plausible precursors to the origin of life.
- To highlight the potential for experimental investigation of early chemical steps on aerosols.
Main Methods:
- Utilizing an inverted micelle model to explain aerosol organic content.
- Applying principles of fluid dynamics (aerodynamic drag, surface tension, gravity) to predict aerosol size and atmospheric lifetime.
- Theoretical postulation of aerosol environments for prebiotic chemistry.
Main Results:
- Aerosol particles of specific sizes exhibit long atmospheric lifetimes.
- These aerosols possess the capacity to concentrate molecules under diverse physical conditions.
- The physical characteristics of aerosols align with requirements for early chemical evolution.
Conclusions:
- Atmospheric aerosols could have served as crucial micro-environments for prebiotic chemistry.
- Aerosols are proposed as potential precursors to the first life forms, analogous to single-celled organisms.
- Experimental studies can investigate the initial chemical transformations occurring within aerosols.